142 Chapter 6
Troubleshooting the IF Section
Verifying the A7 Digital IF Board
9. If your instrument contains Option 124 Video Out, See the Option
124 Troubleshooting section of this service guide for details on
verifying the video out port.
Digital IF Assembly Detailed Troubleshooting
If the quick check power level is not correct, other items can be checked
to verify the A7 digital IF assembly.
The remaining detailed checks require the digital IF assembly to be
placed on an extender board (p/n E4406-60021). Turn the instrument
off before removing a PC board assembly from the instrument.
Measure the voltages on the extender board. If the levels are incorrect,
or the clock measurements (using an oscilloscope) from Figure 6-1 are
incorrect, suspect the A7 digital IF assembly as being defective.
Figure 6-1 A7 Clock Measurements (E4440-60025, E4440-60195)
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